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​(A proofreader's note regarding “vocation” and “avocation”)

One's “vocation” is the thing at which he works
For his main source of income and his perqs.
From it, he may vacation
To ply his “avocation,”
A diversion as enjoyed as any clerk's.

In our yard was a dog called Nick,
With a voice that was loud and thick;
To bark was his “vocation,”
To sniff, his “avocation,”
For the former was his calling and his shtick.